Regional relationships between inherent coffee quality and growing environment for denomination of origin labels in Nariño and Cauca, Colombia - Oberthür, Thomas; Läderach, Peter R.D.; Posada Suárez, Húver; Fisher, Myles J.; Samper, Luis F; Illera, Julia; Collet, L; Moreno, Edgar; Alarcón, Rodrigo; Villegas, Andres; Usma, Herman; Pérez, Carolina; et al. (Elsevier, 2011)